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  1. or download this
    tie my %hash, 'Tie::Hash::Vivify', sub { 10 };
say $hash{foo};  # says 10
my $is_this_true = exists $hash{foo};
  2. or download this
    tie my %hash, 'Hash::DefaultValue', sub { 10 };
say $hash{foo};
my $is_this_true = exists $hash{foo};
  3. or download this
    tie my %hash, 'Hash::DefaultValue', sub { uc };
say $hash{foo}; # says "FOO"